Initial Release

pio/uart_tx/uart_tx.c

@@ -0,0 +1,27 @@
+/**
+ * Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include "pico/stdlib.h"
+#include "hardware/pio.h"
+#include "uart_tx.pio.h"
+
+int main() {
+    // We're going to use PIO to print "Hello, world!" on the same GPIO which we
+    // normally attach UART0 to.
+    const uint PIN_TX = 0;
+    // This is the same as the default UART baud rate on Pico
+    const uint SERIAL_BAUD = 115200;
+
+    PIO pio = pio0;
+    uint sm = 0;
+    uint offset = pio_add_program(pio, &uart_tx_program);
+    uart_tx_program_init(pio, sm, offset, PIN_TX, SERIAL_BAUD);
+
+    while (true) {
+        uart_tx_program_puts(pio, sm, "Hello, world! (from PIO!)\n");
+        sleep_ms(1000);
+    }
+}